Waste Water



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water pollution (2)

  • ARE YOU SWIMMING IN A SEWER?

Waste Water

Boston Harbor

  • Ten years ago it was one of the most polluted harbors
  • First environmental law in the United States was passed in Boston in 1656, restricting butchers from dumping animal parts and other garbage into the harbor waters
  • In the 1660's, Boston Harbor was the major import harbor from England

Boston Harbor

  • In 1796, there were a series of illnesses breaking out
  • The 1863 cholera epidemic lead to a public cry for improved sewage
  • In the latter part of the 1800's, warnings were posted to not swim in the Boston Harbor for fear of boils.

Boston Harbor

  • They built two sewage treatments plants-in 1889 and 1899 –an improvement but they still pumped raw sewage into the harbor
  • They ignored the Clean Water Act passed by Congress in 1972

Water Treatment

  • Large and small debris screened out on Nut Island
  • Waste water sent to Deer Island where larger particles are allowed to settle out-sludge
  • Sludge sent to digesters
  • Primary Treatment

Water Treatment

  • Biological process
  • Wastewater and microorganisms are combined in tanks
  • Secondary sludge sent to digesters
  • Sludge converted to fertilizer pellets
  • Clarified water mixed with bleach
  • Declorinated and discharged into bay
  • Secondary Treatment

How dangerous is the wastewater that we put in the sea?

  • Contamination can lead to detrimental effects in fish and other species. Shown here is a fish with tumors.

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